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To: Ali Chen who wrote (127520)	2/16/2001 1:01:47 PM
From: Scumbria	Respond to of 186894

Ali, A) the P4 operates at effectively half of the specified frequency when doing real job; Interesting. I guess that explains why some benchmarks are even much lower than expected. Scumbria

To: Ali Chen who wrote (127520)	2/16/2001 1:50:34 PM
From: EricRR	Respond to of 186894

Intel incorporates a thermal sensor that stops the internal clock for 50% of the time if the die temperature exceeds some point: ftp://download.intel.com/design/Pentium4/guides/24920301.pdfSee pp.23-24 So, it works in two ways: A) the P4 operates at effectively half of the specified frequency when doing real job; B) by using really enormous cooler. So a 1.5GHz chip has different performance characteristics depending on the heatsink? As summer approachs, we can expect P4 benchmarks to decrease.